- Hugh Davies
Electronic keyboard instrument developed by Bruno Helberger (b Frankfurt am Main, Germany, 1884; d Vienna, Austria, 1951) from the Hellertion, the result of an earlier collaboration with Peter Lertes. The first version of the Heliophon was completed in Berlin in 1936, but it was destroyed during World War II; a second version was built in Vienna in 1947 (one of the two models is now in D.B.im). Helberger continued to develop and improve the instrument until his death, after which the work was continued in Vienna by Wolfgang Wehrmann. The sounds of the Heliophon are generated by electronic oscillators. Its total range is seven octaves and it has two 58-note, touch-sensitive manuals (staggered as in a ‘spinet’ organ), on each of which up to three pitches (with different timbres) can be played simultaneously; six pedals control individual volume levels and two knee-levers produce vibrato. In front of each manual is a ribbon controller, which is used to create glissandos and timbre changes....